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2019 Energy Code (Energy Standards) Water Heating ...

Recirculation loops serving multiple dwelling units, high-rise residential, hotel/motel, and nonresidential occupancies must meet/have all of the following: A. Air release valve or vertical pump installation B. Recirculation loop backflow prevention C. Equipment for pump priming D. Pump isolation valves

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  Prevention, Residential, Backflow, Backflow prevention

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